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tracing.go
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tracing.go
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package tracing
import (
"fmt"
"net"
propjaeger "go.opentelemetry.io/contrib/propagators/jaeger"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/exporters/jaeger"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/sdk/resource"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.5.0"
"go.opentelemetry.io/otel/trace/noop"
)
// EndpointType represents the type of the tracing endpoint.
type EndpointType string
const (
EndpointTypeCollector EndpointType = "collector"
EndpointTypeAgent EndpointType = "agent"
)
// InitTracer creates an OTel TracerProvider that exports the traces to a Jaeger agent/collector.
func InitTracer(
serviceName string,
endpoint string,
endpointType EndpointType,
samplingFraction float64,
) (err error) {
if endpoint == "" {
otel.SetTracerProvider(noop.NewTracerProvider())
return nil
}
endpointOption := jaeger.WithCollectorEndpoint(jaeger.WithEndpoint(endpoint))
if endpointType == EndpointTypeAgent {
host, port, err := net.SplitHostPort(endpoint)
if err != nil {
return fmt.Errorf("initializing tracer failed for agent endpoint type: %w", err)
}
endpointOption = jaeger.WithAgentEndpoint(
jaeger.WithAgentHost(host),
jaeger.WithAgentPort(port),
)
}
exp, err := jaeger.New(endpointOption)
if err != nil {
return fmt.Errorf("failed to create Jaeger exporter: %w", err)
}
tp := sdktrace.NewTracerProvider(
sdktrace.WithSampler(sdktrace.ParentBased(sdktrace.TraceIDRatioBased(samplingFraction))),
sdktrace.WithBatcher(exp),
sdktrace.WithResource(
resource.NewWithAttributes(
semconv.SchemaURL,
semconv.ServiceNameKey.String(serviceName),
)),
)
otel.SetTracerProvider(tp)
otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(
propagation.TraceContext{},
propjaeger.Jaeger{},
propagation.Baggage{},
))
return nil
}